To provide a method for hydrocarbon fuel reforming, by which the amount of a fuel is reduced by perfectly burning the fuel without using an expensive catalyst and a complicated mechanism and a pollution-causing factor is minimized, an apparatus therefor and a reforming agent.

This method for hydrocarbon-based fuel reforming is characterized in that a hydrocarbon-based fuel is passed through a layer packed with the reforming agent composed of a ceramic ball mixed with monazite and formed, the hydrocarbon-based fuel is brought in a turbulent state into contact with the ceramic ball and further the hydrocarbon-based fuel is passed through a line of magnetic force by a magnet. This apparatus for hydrocarbon-based fuel reforming is obtained by arranging a screw guide chamber 11 storing a magnet 12 in the inside, forming a multiple spiral flow channel 13 around the magnet and installing magnetic shield 14 and a reforming layer packed with the reforming agent composed of the ceramic ball 4 mixed with monazite and formed in the flow channel of a substance to be treated.